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Rebecca was briefly romantically involved with Horatio Caine, but he broke it off when she made a deal with a criminal suspected of killing a cop, committing a series of robberies, and having a relationship with a 16-year-old girl who took part in his crimes (episode 313, "Cop Killer").

Rebecca was not seen again after their breakup until she appeared as the assigned state prosecutor for Kyle Harmon, Horatio's son, on three occasions, driving a further wedge between her and Horatio (episode 603, "Inside Out", episode 607, "Chain Reaction", episode 613, "Raising Caine").

Rebecca informs Horatio she has to suppress evidence submitted by CSI Jesse Cardoza due to his past history with a previous suspect in his former department. To help Horatio clear Cardoza's name, she sends Eric Delko (now the State Attorney's Forensic Expert) out with him to find the missing evidence from that previous case (episode 816, "L.A.").

Rebecca is later killed in an explosion that was meant for Eric, whom she was meeting with. They were both conducting an internal investigation of the lab after diamonds were stolen from an evidence locker (episode 823, "Time Bomb").